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Reports of Patients with Scabies Surrepticius Masquerading As Prurigo Nodularis Or Systemic Lupus Erythematosus

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Reports of Patients with Scabies Surrepticius Masquerading As Prurigo Nodularis Or Systemic Lupus Erythematosus UC Davis Dermatology Online Journal Title Scabies presenting as cutaneous nodules or malar erythema: reports of patients with scabies surrepticius masquerading as prurigo nodularis or systemic lupus erythematosus Permalink https://escholarship.org/uc/item/5bn8k4vx Journal Dermatology Online Journal, 24(9) Authors Werbel, Tyler Hinds, Brian R Cohen, Philip R Publication Date 2018 DOI 10.5070/D3249041414 License https://creativecommons.org/licenses/by-nc-nd/4.0/ 4.0 Peer reviewed eScholarship.org Powered by the California Digital Library University of California Volume 24 Number 9| September 2018| Dermatology Online Journal || Case Report 24(9): 8 Scabies presenting as cutaneous nodules or malar erythema: reports of patients with scabies surrepticius masquerading as prurigo nodularis or systemic lupus erythematosus Tyler Werbel1 MS, Brian R Hinds2 MD, Philip R Cohen2 MD Affiliations: 1School of Medicine, University of California San Diego, La Jolla, California, USA, 2Department of Dermatology, University of California San Diego, La Jolla, California, USA Corresponding Authors: Tyler Werbel, MS, 7438 High Avenue, La Jolla, CA 92037, Tel: 352-226-0683, Email: [email protected]; Philip R. Cohen, MD, 10991 Twinleaf Court, San Diego, CA 92131, Email: [email protected] Introduction Abstract Sarcoptes scabiei var. hominis is a mite that causes Scabies surrepticius is a unifying term that represents infestations in humans with over 300 million cases non-classical presentations of scabies mite infestation. A patient with scabies surrepticius is per year [1]. The classical presentation is described: a man with scabies masquerading as characterized by generalized pruritus and lesions prurigo nodularis. The 91-year-old man had such as burrows usually found in the finger space metastatic prostate cancer and presented with webs [2]. However, infestations with scabies can diffuse pruritic nodules. Prurigo nodularis was present with unusual morphologies lacking typical suspected; however, the biopsy revealed scabies lesions or clinical clues to the underlying parasite. In mites in the stratum corneum. He was successfully this setting, the infestation has been referred to as treated with topical permethrin 5% cream and oral scabies surrepticius (Box 1), [3, 4]. A man whose ivermectin. In addition, the features of a woman with scabies mimicking systemic lupus erythematosus are scabies mimicked prurigo nodularis is described, and summarized. The 47-year-old woman had idiopathic the features of a woman with scabies mimicking thrombocytopenic purpura and presented with systemic lupus erythematous are reported. In malar erythema and a positive antinuclear antibody addition, the subtypes of scabies surrepticius are (titer 1:320). A diagnosis of systemic lupus summarized. erythematous was entertained until skin scraping and mineral oil preparation revealed scabies mites; she was successfully treated with oral ivermectin. In conclusion, Sarcoptes scabiei infestation can present Case Synopsis with atypical clinical morphology and an absence of A 91-year-old man presented to his primary care classical lesions such as burrows conventionally physician with a one-day history of an itchy rash on distributed in the interdigital web spaces, volar wrists, periumbilical area, or genitalia. Scabies his chest and arms. Acute folliculitis was suspected surrepticius is a term that has been designated to and he was empirically placed on cephalexin 500mg describe these unusual presentations. Prurigo twice daily for 10 days. In addition, betamethasone nodularis and systemic lupus erythematosus can be diproprionate 0.05% ointment was prescribed twice added to the litany of conditions masquerading as daily since the lesions were also pruritic. His lesions scabies and are included amongst the guises of persisted; therefore, the topical corticosteroid scabies surrepticius. ointment was switched to mometasone 0.1% cream, he was started on a methylprednisolone dose pack, Keywords: erythematosus, incognito, lupus, mite, nodularis, and he was referred to a dermatologist for nodule, prurigo, scabies, surrepticius, systemic evaluation. - 1 - Volume 24 Number 9| September 2018| Dermatology Online Journal || Case Report 24(9): 8 Blistering disorders Cutaneous examination showed pruritic, excoriated, Bullous erythematous nodules on the chest, abdomen, Dermatomyositis herpetiformis-like upper back, flanks, axilla, and proximal upper Connective tissue disease extremities (Figure 1). There were no burrows Dermatomyositis-like Systemic lupus erythematosus-like between finger webs or elsewhere on the body. Infiltrative disorders Lesions were absent below the waist, including the Langerhans cell histiocytosis-like scrotum. Urticaria pigmentosa-like Miscellaneous His left chest also demonstrated a 12×8 mm dark Incognito brown and tan, irregularly bordered, pigmented Scalp lesion (Figure 2). There were no palpable neck, Papulosquamous disorders Crusted axillary, or inguinal lymph nodes. His toenails Hidden showed white dyschromia on their surface; there Pityriasis rosea-like were no burrows on the dorsal feet or toe webs. Purpuric disorders Ecchymoses His workup included not only a culture for bacteria Reactive erythema but also skin biopsies of the pruritic abdominal Urticaria nodules for hematoxylin and eosin staining and Box 1. Subtypes of scabies surrepticius direct immunofluorescence studies. The pigmented lesion on the chest was also biopsied. metastatic prostate cancer involving bones and Microscopic examination of the erythematous lymph nodes after prostatectomy ten years ago. nodule on his abdomen revealed a mixed dermal After bony involvement was discovered 18 months infiltrate composed of numerous eosinophils with prior to presentation, he started androgen lymphocytes and histiocytes; within the stratum deprivation therapy and subsequently completed corneum, mite exoskeleton was observed (Figure 3). radiation therapy for a right femoral neck metastatic The direct immunofluorescence studies were lesion. Since then, he has not developed any new negative for IgG, IgM, IgA, C3, Cq1, and fibrinogen. symptoms or pain, and his prostate specific antigen The pigmented lesion demonstrated a poorly has remained suppressed. circumscribed compound melanocytic proliferation Figure 1. Distant A) and closer B) views of the clinical features of a scabies infestation that presented as multiple pruritic, excoriated, erythematous nodules on the abdomen (some of which are circled in purple ink), chest, upper back, flanks, axilla, and proximal upper extremities of a 91-year-old man. - 2 - Volume 24 Number 9| September 2018| Dermatology Online Journal || Case Report 24(9): 8 Figure 2. Distant A) and closer B) views of the clinical features of a melanoma that presented incidentally as a 12×8 mm hyperpigmented lesion (which is circled in purple ink) on the left chest of a 91-year-old man. with invasion of malignant melanocytes into the total body skin checks every 3 months for the next superficial dermis; there was also pagetoid spread of year and every 6 months for the subsequent 4 years. melanocytes into the overlying epidermis (Figure 4). Correlation of the clinical history and pathologic Case Discussion findings of the prurigo nodularis-like lesions Scabies is a common parasitic infection caused by established the diagnosis of not only nodular the mite Sarcoptes scabei [5]. The estimated scabies, but also scabies incognito, both subtypes of worldwide prevalence is approximately 300 million scabies surrepticius. The pigmented lesion on the cases annually [2]. Individuals with scabies chest was a pT1a melanoma with a Breslow thickness infestation usually present with generalized pruritus of 0.2mm. that typically spares the head and face and is worse The bacterial culture grew methicillin-resistant at night. Cutaneous examination usually reveals Staphylococcus aureus and Klebsiella pneumoniae. He was treated with doxycycline 100mg twice daily and ciprofloxacin 500mg twice daily for ten days. The scabies infestation was initially treated with permethrin 5% cream from neck to toe; triamcinolone 0.1% cream, applied twice daily to affected areas, was used for symptomatic treatment of the associated pruritus. However, the rash persisted; therefore, he was prescribed 12mg oral ivermectin to be taken on day one and on day eight. Both his scabies-associated symptoms and skin lesions subsequently resolved completely. Figure 3. Pathology features of a scabetic nodular lesion from the The melanoma was excised. After confirmation of abdomen of a 91-year-old man. An intact intraepidermal mite (Sarcoptes scabiei) in cross section, characterized by a thin clear margins, the wound was repaired with a side to eosinophilic exoskeleton (arrow) is present in the stratum side closure. There has been no recurrence of his corneum. There is a lymphohistiocytic infiltrate in the dermis. H&E, scabies infestation, and he is being followed with 200×. - 3 - Volume 24 Number 9| September 2018| Dermatology Online Journal || Case Report 24(9): 8 burrows which most often localize to the interdigital separated by one week) has also been shown to be web spaces, but may also be present in the axillae, on as effective as permethrin [6]. Other less commonly the breasts, on the buttocks, on the elbows, on the used topical agents include benzyl benzoate, flexor surfaces of the wrists, and on the genitalia. crotamiton, ivermectin, lindane, malathion, and There are often secondary inflammatory papules, sulfur [2]. pustules, excoriations,
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